The Associated Press

COLUMBUS - Police searched a vehicle but found no evidence in an investigation into an arson that killed five college students.

"It turned up nothing," Sgt. Brent Mull, a police spokesman, said Thursday.

A search warrant was filed Wednesday in Franklin County, but its contents were sealed by court order.

Authorities were searching for suspects and a motive for the fire Sunday in a three-story yellow brick house in a popular neighborhood for Ohio State University students.

Two Ohio State students and three students visiting from Ohio University died. Two students remained hospitalized Thursday.

Police have set up a phone line to gather anonymous tips, interviewed those in nearby houses and passed out fliers advertising a reward for information.

They asked the public to turn over videotapes or still photographs of the fire or of a 21st birthday party that had ended about an hour before the blaze broke out.